<div id="menu">
    <ul>
      <li><a href="<?php echo site_url();?>" id="home" <?php if('home' == $current_page):?>class="current"<?php endif;?>></a></li>
      <li><a href="<?php echo site_url('company');?>" id="company" <?php if('company' == $current_page):?>class="current"<?php endif;?>></a></li>
      <li><a href="<?php echo site_url('products');?>" id="product" <?php if('products' == $current_page || 'category' == $current_page):?>class="current"<?php endif;?>></a></li>
      <li><a href="<?php echo site_url('contactus');?>" id="contactus" <?php if('contactus' == $current_page):?>class="current"<?php endif;?>></a></li>
    </ul>
  </div>